ARM AXI 5 reference manual says -
Multi-copy atomicity can be ensured by:• Using a single Point of Serialization (PoS) for a given address, so that all accesses to the same location are ordered. This must ensure that all coherent cached copies of a location are invalidated before the new valueof the location is made visible to any agents
Where is the Point of Serialization in a typical AMBA 5 based SoC? Is it the interconnect?